[PATCH] and more extras/multipath updates

* configure the multipath target with round-robin path selector and
conservative default for a start : yes it makes this release the first
really useful one.
* temporarily disable map creation for single path device due to current
restrictive defaults in the kernel target. Sistina should work it out.
* correct the strncmp logic in blacklist function.

Tested on StorageWorks with 2.6.0-test10-udm1 :

xa-s03:~# ./multipath -v
60001fe1000bdad0000903507109004b (1 0 1 1) /dev/sda op:1 /dev/sda
[HSG80           ]
60001fe1000bdad000090371312100bf (1 0 1 2) /dev/sdb op:1 /dev/sdb
[HSG80           ]
60001fe1000bdad000090371312100c2 (1 0 1 3) /dev/sdc op:1 /dev/sdc
[HSG80           ]
60001fe1000bdad00009037131210067 (1 0 2 1) /dev/sdd op:1 /dev/sdd
[HSG80           ]
60001fe1000bdad000090371312100b3 (1 0 2 2) /dev/sde op:1 /dev/sde
[HSG80           ]
60001fe1000bdad00009035071090024 (1 0 2 3) /dev/sdf op:1 /dev/sdf
[HSG80           ]
600508b4000156d700012000000b0000 (1 0 3 1) /dev/sdg op:1 /dev/sdg
[HSV110 (C)COMPAQ]
600508b4000156c30001200000210000 (1 0 3 2) /dev/sdh op:1 /dev/sdh
[HSV110 (C)COMPAQ]
600508b4000156d700012000000b0000 (1 0 6 1) /dev/sdi op:1 /dev/sdi
[HSV110 (C)COMPAQ]
600508b4000156c30001200000210000 (1 0 6 2) /dev/sdj op:1 /dev/sdj
[HSV110 (C)COMPAQ]

60001fe1000bdad0000903507109004b
 \_(1 0 1 1) /dev/sda op:1 /dev/sda [HSG80           ]
60001fe1000bdad000090371312100bf
 \_(1 0 1 2) /dev/sdb op:1 /dev/sdb [HSG80           ]
60001fe1000bdad000090371312100c2
 \_(1 0 1 3) /dev/sdc op:1 /dev/sdc [HSG80           ]
60001fe1000bdad00009037131210067
 \_(1 0 2 1) /dev/sdd op:1 /dev/sdd [HSG80           ]
60001fe1000bdad000090371312100b3
 \_(1 0 2 2) /dev/sde op:1 /dev/sde [HSG80           ]
60001fe1000bdad00009035071090024
 \_(1 0 2 3) /dev/sdf op:1 /dev/sdf [HSG80           ]
600508b4000156d700012000000b0000
 \_(1 0 3 1) /dev/sdg op:1 /dev/sdg [HSV110 (C)COMPAQ]
 \_(1 0 6 1) /dev/sdi op:1 /dev/sdi [HSV110 (C)COMPAQ]
600508b4000156c30001200000210000
 \_(1 0 3 2) /dev/sdh op:1 /dev/sdh [HSV110 (C)COMPAQ]
 \_(1 0 6 2) /dev/sdj op:1 /dev/sdj [HSV110 (C)COMPAQ]

N|600508b4000156d700012000000b0000 : 0 4194304 multipath 2 2 10
round-robin 2 /dev/sdg 10 2 1 2 /dev/sdi 10 2 1 2
N|600508b4000156c30001200000210000 : 0 20971520 multipath 2 2 10
round-robin 2 /dev/sdh 10 2 1 2 /dev/sdj 10 2 1 2
xa-s03:~# dmsetup ls
600508b4000156c30001200000210000        (254, 1)
600508b4000156d700012000000b0000        (254, 0)
xa-s03:~# ll /dev/mapper/
total 0
brw-------    1 root     root     254,   1 Dec  9 22:57
600508b4000156c30001200000210000
brw-------    1 root     root     254,   0 Dec  9 22:57
600508b4000156d700012000000b0000
crw-------    1 root     root      10,  63 Jul 25 22:48 control
xa-s03:~# dd if=/dev/mapper/600508b4000156c30001200000210000
of=/dev/null bs=1M count=500
500+0 records in
500+0 records out
524288000 bytes transferred in 5.662530 seconds (92589003 bytes/sec)

gee, that pretty fast :)

2 files changed, 24 insertions, 9 deletions

diff --git a/extras/multipath/main.c b/extras/multipath/main.c
index e62d763252..6b1c37cd95 100644
--- a/extras/multipath/main.c
+++ b/extras/multipath/main.c
@@ -214,7 +214,7 @@ blacklist (char * dev) {
 	};
 
 	for (i = 0; blist[i].lengh; i++) {
-		if (strncmp(dev, blist[i].headstr, blist[i].lengh))
+		if (strncmp(dev, blist[i].headstr, blist[i].lengh) == 0)
 			return 1;
 	}
 	return 0;
@@ -562,6 +562,17 @@ add_map(struct env * conf, struct path * all_paths,
 	int i, np;
 	long size = -1;
 
+	/* defaults for multipath target */
+	int dm_nr_path_args         = 2;
+	int dm_path_test_int        = 10;
+	char * dm_ps_name           = "round-robin";
+	int dm_ps_nr_args           = 2;
+	int dm_path_failback_int    = 10;
+	int dm_path_nr_fail         = 2;
+	int dm_ps_prio              = 1;
+	int dm_ps_min_io            = 2;
+
+
 	if (!(dmt = dm_task_create(op)))
 		return 0;
 
@@ -577,7 +588,14 @@ add_map(struct env * conf, struct path * all_paths,
 	}
 	if (np == 0)
 		goto addout;
-	params_p += sprintf(params_p, "%i 32", np);
+	/* temporarily disable creation of single path maps */
+	/* Sistina should modify the target limits */
+	if (np < 2)
+		goto addout;
+
+	params_p += sprintf(params_p, "%i %i %i %s %i",
+			    np, dm_nr_path_args, dm_path_test_int,
+			    dm_ps_name, dm_ps_nr_args);
 	
 	for (i=0; i<=mp[index].npaths; i++) {
 		if (( 0 == all_paths[PINDEX(index,i)].state) ||
@@ -585,8 +603,10 @@ add_map(struct env * conf, struct path * all_paths,
 			continue;
 		if (size < 0)
 			size = get_disk_size(conf, all_paths[PINDEX(index,0)].dev);
-		params_p += sprintf(params_p, " %s %i",
-			all_paths[PINDEX(index,i)].dev, 0);
+		params_p += sprintf(params_p, " %s %i %i %i %i",
+				    all_paths[PINDEX(index,i)].dev,
+				    dm_path_failback_int, dm_path_nr_fail,
+				    dm_ps_prio, dm_ps_min_io);
 	}
 
 	if (size < 0)
diff --git a/extras/multipath/main.h b/extras/multipath/main.h
index a1de1d8d2d..d6dfb14296 100644
--- a/extras/multipath/main.h
+++ b/extras/multipath/main.h
@@ -46,12 +46,7 @@
 #define TUR_CMD_LEN	6
 #define MX_ALLOC_LEN	255
 #define BLKGETSIZE      _IO(0x12,96)
-#define DM_TARGET	"striped"
-/*
 #define DM_TARGET	"multipath"
-#define DM_POLL_INTERVAL	10
-#define DM_PATH_SELECTOR	"latency"
-*/
 
 #define PINDEX(x,y)	mp[(x)].pindex[(y)]